You could buy unflavoured juice and add flavouring to a small amount to see if you like it.

Or you can buy the higher nic mixing stuff and dilute with PG or VG to the strength you want.

If I'm right you can't taste PG and it's thinner than VG, you don't have to do anything to it to dilute your juice. VG is thicker and can have a sweet taste, you can thin it with PG, distilled water or vodka. Vodka can help with throat hit.

Once you have your base juice at the strength you want mix up small amounts with flavourings and see if you like it.